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Re:A Remote Code Execution Vulnerability in the Steam Client by Starz0r on Friday June 01, 2018 @05:28AM (#17203820)
You are in luck, Valve has SteamCMD[1] for users just like yourself! It is a command line version of the Steam client and can do most of what you need like downloading, updating, even verifying game integrity from the command line! I only wish it was open source, maybe someone can reverse engineer it?

[1] https://developer.valvesoftware.com/wiki/SteamCMD

Re:A Remote Code Execution Vulnerability in the Steam Client by xPaw on Friday June 01, 2018 @09:51AM (#17205278)
Steam protocol has been well understood for a while now: https://github.com/steamre/steamkit

Which is based on reverse engineering the Steam client, so you can implement game downloading yourself.

Re:A Remote Code Execution Vulnerability in the Steam Client by Fnoord on Friday June 01, 2018 @02:45PM (#17208681)
It appears to be only for downloading/updating game servers; not for downloading/updating games.
Re:A Remote Code Execution Vulnerability in the Steam Client by Laaas on Friday June 01, 2018 @08:19AM (#17204581)
but how do you run a game from that?
Re:A Remote Code Execution Vulnerability in the Steam Client by h1d on Friday June 01, 2018 @08:36AM (#17204692)
If it's possible someone can come up with a small UI that only lists and launches games.
Re:A Remote Code Execution Vulnerability in the Steam Client by Fnoord on Friday June 01, 2018 @02:43PM (#17208652)
Playnite [1]. Open source, lightning fast, and light on resources. You can even combine different platforms such as Steam + Battle.net. Saves you running each of these. Though you lose things like downloads and social. Heck, it even has support for emulators.

[1] https://playnite.link

Re:A Remote Code Execution Vulnerability in the Steam Client by Rumudiez on Friday June 01, 2018 @10:31AM (#17205613)
From the article: https://github.com/DioJoestar/SteamCMD-GUI/blob/master/READM...

They don’t seem to have a *nix referral, but seems totally possible to make.